Question

5．口算

0.36÷9=	3.97-2.45=	16×25=	5.2+3.8=	8.282÷8.2=
10-0.87=	4.3+1.8=	18.9-9.8=	0.8÷0.1=	0.3+0.36=
1.14×0.2=	7.8÷3=	0.8×15=	0.125×8=	4-1.08=
9×1.8=	1.2×8=	7.82+1.18=	30.5÷2=	1.8×0.2=
0.75÷30=	0.25×3=	4.8+1.2=	0.5×48=	0.7×7=
1.1×9=	25×0.8=	3.2×5=	3×1.2=	2.04×4=
0.72+2.8=	0×3.97=	0.13×80=	18×30=	50×4.1=
0.125×2=	6×0.75=	1.01-0.89=	9.767×0=	0.02×0.3=
3.9÷5=	1÷0.125=	70÷5=	0÷9.126=	0.72=
16.5÷0.15=	7÷1.4=	1.21÷11=	0.84÷0.42=	0.7×0.9=
0.3×400=	5.1÷0.3=	8.3+1.7=	4.9÷0.7=	0.3+0.3+0.3=
0.81÷0.9×5=	（0.9+8.1）×5=	0.32=	9.3÷（4.2-1.1）=	1.7×0.6÷1.7=

Answer 1

分析 根据小数加减乘除法的计算方法进行计算．

解答 解：

0.36÷9=0.04	3.97-2.45=1.52	16×25=400	5.2+3.8=9	8.282÷8.2=1.01
10-0.87=9.13	4.3+1.8=6.1	18.9-9.8=9.1	0.8÷0.1=8	0.3+0.36=0.66
1.14×0.2=0.228	7.8÷3=2.6	0.8×15=12	0.125×8=1	4-1.08=2.92
9×1.8=16.2	1.2×8=9.6	7.82+1.18=9	30.5÷2=15.25	1.8×0.2=0.36
0.75÷30=0.025	0.25×3=0.75	4.8+1.2=6	0.5×48=24	0.7×7=4.9
1.1×9=9.9	25×0.8=20	3.2×5=16	3×1.2=3.6	2.04×4=8.16
0.72+2.8=3.52	0×3.97=0	0.13×80=10.4	18×30=540	50×4.1=205
0.125×2=0.25	6×0.75=4.5	1.01-0.89=0.12	9.767×0=0	0.02×0.3=0.006
3.9÷5=0.78	1÷0.125=8	70÷5=14	0÷9.126=0	0.72=0.49
16.5÷0.15=110	7÷1.4=5	1.21÷11=0.11	0.84÷0.42=2	0.7×0.9=0.63
0.3×400=120	5.1÷0.3=17	8.3+1.7=10	4.9÷0.7=7	0.3+0.3+0.3=0.9
0.81÷0.9×5=4.5	（0.9+8.1）×5=45	0.32=0.09	9.3÷（4.2-1.1）=3	1.7×0.6÷1.7=0.6

点评 口算时，注意运算符号和数据，然后再进一步计算．